Answers (2)

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You can use v=w/k, this is the velocity along x-axis. If you know how to find angle made by velocity with x-axis or in other words tangent to cosine curve when cos x=(6/12)=0.5 and then use v(net)=v/cos(angle made with x-axis).

Due to lack of time I am just suggesting one of the way. Similar questions were in HC Verma. Please take a look I exactly do not remember.